1, laziness - devs not checking everything and rushing the job just to beat the competition, case point EA with NFSW Vs Atari with TDU2, EA should know better!
2, DLC, pretty much everything that everyone else has said, including about borderlands, although i'll add about the fallout 3 DLC, urgh, playable game then you spend more money to make it worse? totally not on Bethesda
3, Release dates - why bother? RD are a PITA - the game will be out by blah blah blah, day comes, oh sorry it's postponed by 6 months, AARRGGHH, sometimes i wish they wouldnt bother with release dates, just give you the option for pre-order and then forget about it lol
4, graphics over gameplay, looking back to the old days of gaming this has gotten so much worse it's not even funny, devs think that shiny shiny will distract from the often shoddy and short storys in a game, in some ways yeah it works, but not everytime,
5, Money for well not much IMO-, back in the day ( yeah am old lol ) you'd pay 20-30 quid for a brand new game, it would come with a decent story most times, depending on what type of game it is, cliffnotes version, games need more story and depth, comparing playstation 2 comes on dvd, thats 4.7Gb or just under 9Gb on a DL disc, you get hundreds of hours of game play ( final fantasy X my main is on 475 hours and i still have things to do ), playstation 3 comes on blu ray, thats 25Gb at least, 50 on a dual layer, they really cant be using all that extra space of stupid sodding textures for the HD content